Message type: E = Error
Message class:  CNV - Conversion: Messages for Conversion Services (CNCC) 
Message number: 409
Message text: User &1 was locked.
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The SAP error message CNV409 "User &1 was locked" typically indicates that a specific user account has been locked in the SAP system. This can happen for various reasons, such as multiple failed login attempts, administrative actions, or security policies in place.
Cause: Failed Login Attempts: The user may have entered incorrect credentials multiple times, leading to the account being locked. Administrative Lock: An administrator may have manually locked the user account for security reasons or due to inactivity. Password Expiration: If the user's password has expired and they have not updated it, the account may be locked. Security Policies: Certain security settings in the SAP system may automatically lock accounts after a specified number of failed login attempts.
Solution: Unlock the User Account: An administrator can unlock the user account using transaction code SU01 (User Maintenance). Enter the locked user ID and click on the "Lock/Unlock" button to unlock the account. Check User Status: In transaction SU01, check the user
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